Trying to diagnose a rotational noise... - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 06-07-2013, 10:41 AM   #1 (permalink)
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Trying to diagnose a rotational noise...

Vehicle is a 97TJH, 5speed, with HP30 front (lockrite) and 8.8 rear (detroit). its got an AA SYE, and CV driveshaft that was made from a cut-down ford F250(I think) front shaft a couple years ago....

so heres the deal...

it sounds like theres mild interferance on something maybe? dup dup dup dup dup dup sound that speeds up as the speed builds. at 40mph its fast enough that its a moaning sound almost. in first, just rolling, I hear individual 'noises'. i only hear it when im on power. not while coasting. Its faster as speed increases, NOT as RPMs increase. disengage clutch, its quiet, engage, its back. I cant tell exactly where its coming from... 'underneath' is about as accurate as I can get. the jeep is loud as hell, so pinpointing a sound is a little tough.

I initially thought it was my front lockrite locker but only on power eliminates that

I think it sounds like transfer case, rear axle or driveshaft. Ive pulled the shaft, and the joints and CV joint seem good.

pulled the rear cover and the fluid (about 2 years old) looks brand new. no signs of water, metal shavings, or anything funky. I havent pulled the carrier yet, cuase I want to avoid that if possible (its a pain in the ass with an 8,8, c-clips and a detroit locker... just more trouble than I want if it can be avoided)

the ONLY thing I see now is a big of 'play' at the AA SYE's tailshaft... its got maybe 1degree of 'play' and makes a nice solid 'thud' when that play is up and it 'engages'

another note, Ive got some kinda fluid on the bottom of my tub around the t-case, but have had it all apart and cant find where its coming from. theres noe on the case, around the yokes or even on the t-case skid itself. and its not enough that it drips. just a light coating. and thres plenty of ATF in the case.

any other suggestions for thigns to try or look into?

also, just double checked trans... fluid is good, full, clean Redline MT90 fluid.


thanks in advance for any tips or suggestions.

Last edited by y2knole; 06-07-2013 at 10:43 AM.
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Old 06-07-2013, 12:47 PM   #2 (permalink)
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ran over to my neighborhood driveline shop and had them double check that the cv joint on my shaft was good... they were happy, so that rules that out...
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Old 06-12-2013, 07:16 AM   #3 (permalink)
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The 8.8 is off set a little that could be the whole problem. Jess
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